Hello, > "Christoph Pleger": >> I am coming back to this old thread from March/April 2015. Because, when >> just switching from Debian 8 to Ubuntu 16.04 on the NFS client, without >> changing anything on the NFS server, I get "Operation not supported" >> again >> when trying to write anything to a read-write aufs on top of a read-only >> NFS. > > Amazingly old mail thread. > Anyway, would you try strace and find which systemcall returns the > error? > And if you can, try re-compiling aufs module with CONFIG_AUFS_DEBUG=y, > set the module parameter 'debug' to Y, and reproduce the problem. Then > we may be able to see something in the kernel log if we have a luck.
After installing the new-compiled module to the initramfs, the test computer does not boot as far as it did before, but I can see interesting messages on the console, like this: [ 193.1356342] aufs au_do_cpup_xattr:96:setupcon[987]: system.nfs4_acl, err -95 I compared the kernel configs of Debian 8 and Ubuntu 16.04 and found that that the Ubuntu kernel has an option "CONFIG_AUFS_XATTR", which is not present in the Debian kernel. Regards Christoph ------------------------------------------------------------------------------
